Date: Thu, 30 Aug 2001 17:14:33 +0200 (CEST) From: Martin Blapp <mb@imp.ch> To: Bruce Evans <bde@zeta.org.au> Cc: <bkarp@icsi.berkeley.edu>, <kpielorz@tdx.co.uk>, <sthaug@nethelp.no>, <atrn@zeta.org.au>, <roberto@eurocontrol.fr>, <drussell@saturn-tech.com>, <phk@FreeBSD.ORG>, <Patrick.Guelat@imp.ch>, <freebsd-hackers@FreeBSD.ORG>, <freebsd-smp@FreeBSD.ORG> Subject: Re: Clock speedup on 4.X FreeBSD SMP and serverworks chipset Message-ID: <20010830171101.I676-100000@levais.imp.ch> In-Reply-To: <20010831001909.W2482-100000@besplex.bde.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi, Together with Thomas Moestel, I have found that the following patch seems to solve the gettimeofday() problem and stops the time drift: --- sys/i386/isa/clock.c Thu Aug 30 17:01:31 2001 +++ sys/i386/isa/clock.c.new Thu Aug 30 17:01:29 2001 @@ -1203,7 +1203,7 @@ high = inb(TIMER_CNTR0); count = timer0_max_count - ((high << 8) | low); if (count < i8254_lastcount || - (!i8254_ticked && (clkintr_pending || + (!i8254_ticked && (/*clkintr_pending || */ ((count < 20 || (!(ef & PSL_I) && count < timer0_max_count / 2u)) && #ifdef APIC_IO #define lapic_irr1 ((volatile u_int *)&lapic)[0x210 / 4] /* XXX XXX */ We are looking now why this happens. Bruce: I've looked once what value of apic_8254_intr and it was below 24. I'll dicuss your change with Thomas and see if that makes the same diff as our patch. Martin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010830171101.I676-100000>